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Note 13 - Income Taxes (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  

Year Ended December 31,

 
  

2020

  

2019

  

2018

 

Income before income taxes:

            

Domestic

 $146,055  $188,174  $183,169 

Foreign

  5,668   1,349   - 

Total

  151,723   189,523   183,169 
             

Current provision

            

Federal

 $67,988  $20,303  $31,819 

State

  6,706   4,648   6,291 

Total

  74,694   24,951   38,110 

Deferred provision

            

Federal

  (37,683)  20,925   6,082 

State

  (1,254)  2,064   (85)

Foreign

  1,079   -   - 

Total

  (37,858)  22,989   5,997 

Provision (benefit) for income taxes

 $36,836  $47,940  $44,107 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

Year Ended December 31,

 
  

2020

  

2019

  

2018

 

Income taxes at the federal statutory rate

 $31,862  $39,530  $38,469 

State income taxes, net of federal benefit

  4,487   5,303   4,913 

Tax effect of permanent differences

  283   1,562   596 

Foreign tax rate differential

  (111)  -   - 

Other, net

  315   1,545   129 

Provision (benefit) for income taxes

 $36,836  $47,940  $44,107 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

December 31,

 
  

2020

  

2019

 

Deferred income tax (assets) liabilities:

        

Inventory

 $(4,329) $(5,086)

Accounts receivable

  (168)  (140)

Finance lease obligations

  (27,522)  (21,618)

Finance and operating leases

  (13,607)  (12,726)

Stock options

  (7,463)  (8,749)

Accrued liabilities

  (7,680)  (2,989)

State net operating loss carry forward

  (1,101)  (2,381)

State tax credit

  (193)  (196)

Other

  (3,302)  (3,817)

Difference between book and tax basis- Operating lease assets

  13,444   12,628 

Difference between book and tax basis- Depreciation and amortization

  178,360   209,250 
   126,439   164,176 

Valuation allowance

  -   121 

Net deferred income tax liability

 $126,439  $164,297 
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
  

2020

  

2019

  

2018

 

Unrecognized tax benefits at beginning of period

 $3,007  $2,389  $2,555 

Gross increases – tax positions in current year

  651   1,188   504 

Reductions due to lapse of statute of limitations

  (353)  (570)  (670)

Unrecognized tax benefits at end of period

 $3,306  $3,007  $2,389